Rwandan-backed M23 rebels say they are now in control of the key eastern Congolese city of Goma. Their fighters continue to claim more territory in one of the world's most mineral-rich territories.

Goma, Democratic Republic of the Congo - Residents and M23 supporters shout slogans as they celebrate the takeover of the city by M23 fighters at the governor's office compound in Goma, after the M23 (March 23 Movement) rebel group launched a large-scale offensive in eastern DRC.

Advances being made by the M23 rebel group in the Democratic Republic of Congo are "heightening the threat of a regional war," according to U.N. Secretary General Antonio Guterres.